What are the servlet conversation technologies?

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First, cookie session.

(1) create a Cookie

1. Create cookie

Cookie cookie=new Cookie ("name", "zhangsan"); / / Chinese is not allowed in cookie. If you need to put it in Chinese, you must encode it.

Cookie cookie=new Cookie ("name", java.net.URLEncoder.encode ("Zhang San", "utf-8"); / / Encoding

Java.net.URLDecoder.decode (cookie.getValue (), "utf-8") / / Decoding

two。 Set the lifecycle of cookie (seconds)

Cookie.setMaxAge (3600)

Cookie.setMaxAge (negative); / / the browser will expire when it is closed.

Cookie.setMaxAge (0); / / Delete this cookie

3. Write back the cookie information to the browser

Response.addCookie (cookie); / / this sentence is very important. Whenever you delete cookie.setMaxAge (0), you have to write back to the past.

(2) read Cookie

1. Read all cookie information

Cookie cookies [] = request.getCookie ()

two。 Benefit all the cookie

For (int iTuno Bandi)